coca20000

Ultrasound ˈʌltrəsaʊnd ˈʌltrəˌsaʊnd N.["超声","超声波

This flashcard explains 'ultrasound,' a noun meaning 'sound waves with frequencies above the human hearing range' or 'ultrasonic waves.'

该闪卡解释了“ultrasound”，它是一个名词，指“超声”或“超声波”。

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